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  Handheld device loudspeaker systemRelated Patent Categories: Telecommunications, Transmitter And Receiver At Same Station (e.g., Transceiver), Radiotelephone Equipment Detail, Hands-free Or Loudspeaking ArrangementHandheld device loudspeaker system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20050221867, Handheld device loudspeaker system. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The present invention relates in general to audio systems for handheld devices. More particularly, the present invention relates loudspeakers and electronics for driving loudspeakers for handheld devices. BACKGROUND OF THE INVENTION [0002] In the past decade cellular telephones have become very popular. Many cellular service subscribes use their cellular telephones as much as, or more than their conventional telephones. Given the high reliance on cellular telephones, there is an interest in making cellular telephones that have functionality comparable to conventional telephones. [0003] To that end, speakerphone capability has been added to cellular telephones. Operating in speakerphone mode, a cellular telephone uses a loudspeaker to output received audio, and sensitive microphone to pick up a voice or voices of one or more users who may be a few feet away from the cellular telephone. As in the case of conventional telephones, speakerphone mode can be used to allow more than one person to participate in a conversation with another party using a single cellular telephone. In such a mode of use, it is beneficial to have a loudspeaker that emits strongly over a large solid angle, so that, for example the cellular telephone could be set on a desk and people positioned around the desk would be able to hear the loudspeaker. [0004] On the other hand, some users prefer to use a cellular telephone as they would a walkie-talkie. In such a mode of use the cellular telephone is often held in front of the user's face, (as opposed to being held to the ear). Although it is also preferable to use a loudspeaker in this mode, there is no need for the loudspeaker to emit over a large solid angle, and in fact, this is undesirable in that it may facilitate unwanted eavesdropping or disturb others in the vicinity if the cellular telephone is being used in a public place. [0005] It would be desirable to have a handheld device loudspeaker system that allows a measure of control over a number of other people that will be able to overhear parts of a conversation output by the handheld device loudspeaker system. BRIEF DESCRIPTION OF THE FIGURES [0006] The present invention will be described by way of exemplary embodiments, but not limitations, illustrated in the accompanying drawings in which like references denote similar elements, and in which: [0007] FIG. 1 is a perspective view of a first embodiment of a cellular telephone; [0008] FIG. 2 is a perspective view of a loudspeaker accessory for the cellular telephone shown in FIG. 1; [0009] FIG. 3 is a side view of the loudspeaker accessory shown in FIG. 2, configured to radiate audio directionally; [0010] FIG. 4 is a cross-sectional elevation view of the loudspeaker accessory shown in FIGS. 2,3; [0011] FIG. 5 is a normalized polar sound pressure level plot in decibels for a loudspeaker that is a functional analog of a first loudspeaker used in the loudspeaker accessory shown in FIGS. 2-4; [0012] FIG. 6 is a normalized polar sound pressure level plot in decibels for a loudspeaker that is a functional analog of a second loudspeaker used in the loudspeaker accessory shown in FIGS. 2-4; [0013] FIG. 7 is a plot of magnitude versus frequency for a filter designed to compensate for differences between electric-to-acoustic signal transfer functions of the first and second loudspeakers used in the loudspeaker accessory shown in FIGS. 2-4; [0014] FIG. 8 is a plot of phase versus frequency for the filter designed to compensate for differences between electric-to-acoustic signal transfer functions of the first and second loudspeakers used in the loudspeaker accessory shown in FIGS. 2-4; [0015] FIGS. 9-12 are polar sound pressure level plots in decibels for the loudspeaker accessory shown in FIGS. 2-4 when driving both loudspeakers with variously filtered signals applied to one loudspeaker; [0016] FIG. 13 is an electrical schematic in block diagram form of the cellular telephone and loudspeaker accessory shown in FIGS. 1-4; [0017] FIG. 14 is a front view of a second embodiment of a cellular telephone that includes an improved loudspeaker system; [0018] FIG. 15 is a cross-sectional view of a top half of the cellular telephone shown in FIG. 14 showing two loudspeakers and associated acoustic structure; [0019] FIG. 16 is a front view of third embodiment of a cellular telephone that includes an improved loudspeaker system; [0020] FIG. 17 is a back view of the cellular telephone shown in FIG. 16; [0021] FIG. 18 is a cross-sectional view of a top half of the cellular telephone shown in FIGS. 16-17 showing two loudspeakers and associated acoustic structure; Continue reading about Handheld device loudspeaker system... Full patent description for Handheld device loudspeaker system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Handheld device loudspeaker system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Handheld device loudspeaker system or other areas of interest. ### Previous Patent Application: Emergency notification method and mobile communication device using the same Next Patent Application: Method and apparatus for volume reduction in a vehicle Industry Class: Telecommunications ### FreshPatents.com Support Thank you for viewing the Handheld device loudspeaker system patent info. 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